21500442144051 has 32 divisors (see below), whose sum is σ = 31336334050560. Its totient is φ = 13032264541824.

The previous prime is 21500442143977. The next prime is 21500442144067. The reversal of 21500442144051 is 15044124400512.

It is not a de Polignac number, because 21500442144051 - 2¹³ = 21500442135859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21500402144051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26151105 + ... + 26960733.

It is an arithmetic number, because the mean of its divisors is an integer number (979260439080).

Almost surely, 2^{21500442144051} is an apocalyptic number.

21500442144051 is a deficient number, since it is larger than the sum of its proper divisors (9835891906509).

21500442144051 is a wasteful number, since it uses less digits than its factorization.

21500442144051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819875.

The product of its (nonzero) digits is 25600, while the sum is 33.

Adding to 21500442144051 its reverse (15044124400512), we get a palindrome (36544566544563).

The spelling of 21500442144051 in words is "twenty-one trillion, five hundred billion, four hundred forty-two million, one hundred forty-four thousand, fifty-one".